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Date: Mon, 12 Aug 2019 09:18:32 -0700
From: Pravin Shelar <pshelar@....org>
To: Paul Blakey <paulb@...lanox.com>
Cc: Linux Kernel Network Developers <netdev@...r.kernel.org>,
"David S. Miller" <davem@...emloft.net>,
Justin Pettit <jpettit@...ira.com>,
Simon Horman <simon.horman@...ronome.com>,
Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
Vlad Buslov <vladbu@...lanox.com>,
Jiri Pirko <jiri@...lanox.com>, Roi Dayan <roid@...lanox.com>,
Yossi Kuperman <yossiku@...lanox.com>,
Rony Efraim <ronye@...lanox.com>, Oz Shlomo <ozsh@...lanox.com>
Subject: Re: [PATCH net-next] net: openvswitch: Set OvS recirc_id from tc
chain index
On Sun, Aug 11, 2019 at 3:46 AM Paul Blakey <paulb@...lanox.com> wrote:
>
>
> On 8/8/2019 11:53 PM, Pravin Shelar wrote:
> > On Wed, Aug 7, 2019 at 5:08 AM Paul Blakey <paulb@...lanox.com> wrote:
> >> Offloaded OvS datapath rules are translated one to one to tc rules,
> >> for example the following simplified OvS rule:
> >>
> >> recirc_id(0),in_port(dev1),eth_type(0x0800),ct_state(-trk) actions:ct(),recirc(2)
> >>
> >> Will be translated to the following tc rule:
> >>
> >> $ tc filter add dev dev1 ingress \
> >> prio 1 chain 0 proto ip \
> >> flower tcp ct_state -trk \
> >> action ct pipe \
> >> action goto chain 2
> >>
> >> Received packets will first travel though tc, and if they aren't stolen
> >> by it, like in the above rule, they will continue to OvS datapath.
> >> Since we already did some actions (action ct in this case) which might
> >> modify the packets, and updated action stats, we would like to continue
> >> the proccessing with the correct recirc_id in OvS (here recirc_id(2))
> >> where we left off.
> >>
> >> To support this, introduce a new skb extension for tc, which
> >> will be used for translating tc chain to ovs recirc_id to
> >> handle these miss cases. Last tc chain index will be set
> >> by tc goto chain action and read by OvS datapath.
> >>
> >> Signed-off-by: Paul Blakey <paulb@...lanox.com>
> >> Signed-off-by: Vlad Buslov <vladbu@...lanox.com>
> >> Acked-by: Jiri Pirko <jiri@...lanox.com>
> >> ---
> >> include/linux/skbuff.h | 13 +++++++++++++
> >> include/net/sch_generic.h | 5 ++++-
> >> net/core/skbuff.c | 6 ++++++
> >> net/openvswitch/flow.c | 9 +++++++++
> >> net/sched/Kconfig | 13 +++++++++++++
> >> net/sched/act_api.c | 1 +
> >> net/sched/cls_api.c | 12 ++++++++++++
> >> 7 files changed, 58 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> >> index 3aef8d8..fb2a792 100644
> >> --- a/include/linux/skbuff.h
> >> +++ b/include/linux/skbuff.h
> >> @@ -279,6 +279,16 @@ struct nf_bridge_info {
> >> };
> >> #endif
> >>
> >> +#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
> >> +/* Chain in tc_skb_ext will be used to share the tc chain with
> >> + * ovs recirc_id. It will be set to the current chain by tc
> >> + * and read by ovs to recirc_id.
> >> + */
> >> +struct tc_skb_ext {
> >> + __u32 chain;
> >> +};
> >> +#endif
> >> +
> >> struct sk_buff_head {
> >> /* These two members must be first. */
> >> struct sk_buff *next;
> >> @@ -4050,6 +4060,9 @@ enum skb_ext_id {
> >> #ifdef CONFIG_XFRM
> >> SKB_EXT_SEC_PATH,
> >> #endif
> >> +#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
> >> + TC_SKB_EXT,
> >> +#endif
> >> SKB_EXT_NUM, /* must be last */
> >> };
> >>
> >> diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
> >> index 6b6b012..871feea 100644
> >> --- a/include/net/sch_generic.h
> >> +++ b/include/net/sch_generic.h
> >> @@ -275,7 +275,10 @@ struct tcf_result {
> >> unsigned long class;
> >> u32 classid;
> >> };
> >> - const struct tcf_proto *goto_tp;
> >> + struct {
> >> + const struct tcf_proto *goto_tp;
> >> + u32 goto_index;
> >> + };
> >>
> >> /* used in the skb_tc_reinsert function */
> >> struct {
> >> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> >> index ea8e8d3..2b40b5a 100644
> >> --- a/net/core/skbuff.c
> >> +++ b/net/core/skbuff.c
> >> @@ -4087,6 +4087,9 @@ int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb)
> >> #ifdef CONFIG_XFRM
> >> [SKB_EXT_SEC_PATH] = SKB_EXT_CHUNKSIZEOF(struct sec_path),
> >> #endif
> >> +#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
> >> + [TC_SKB_EXT] = SKB_EXT_CHUNKSIZEOF(struct tc_skb_ext),
> >> +#endif
> >> };
> >>
> >> static __always_inline unsigned int skb_ext_total_length(void)
> >> @@ -4098,6 +4101,9 @@ static __always_inline unsigned int skb_ext_total_length(void)
> >> #ifdef CONFIG_XFRM
> >> skb_ext_type_len[SKB_EXT_SEC_PATH] +
> >> #endif
> >> +#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
> >> + skb_ext_type_len[TC_SKB_EXT] +
> >> +#endif
> >> 0;
> >> }
> >>
> >> diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
> >> index bc89e16..0287ead 100644
> >> --- a/net/openvswitch/flow.c
> >> +++ b/net/openvswitch/flow.c
> >> @@ -816,6 +816,9 @@ static int key_extract_mac_proto(struct sk_buff *skb)
> >> int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
> >> struct sk_buff *skb, struct sw_flow_key *key)
> >> {
> >> +#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
> >> + struct tc_skb_ext *tc_ext;
> >> +#endif
> >> int res, err;
> >>
> >> /* Extract metadata from packet. */
> >> @@ -848,7 +851,13 @@ int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
> >> if (res < 0)
> >> return res;
> >> key->mac_proto = res;
> >> +
> >> +#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
> >> + tc_ext = skb_ext_find(skb, TC_SKB_EXT);
> >> + key->recirc_id = tc_ext ? tc_ext->chain : 0;
> >> +#else
> >> key->recirc_id = 0;
> >> +#endif
> >>
> > Most of cases the config would be turned on, so the ifdef is not that
> > useful. Can you add static key to avoid searching the skb-ext in non
> > offload cases.
>
> Hi,
>
> What do you mean by a static key?
>
https://www.kernel.org/doc/Documentation/static-keys.txt
Static key can be enabled when a flow is added to the tc filter.
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